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SmIr2Si2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Sm2+ is bonded in a 8-coordinate geometry to eight equivalent Si4- atoms. All Sm–Si bond lengths are 3.26 Å. Ir3+ is bonded in a 4-coordinate geometry to four equivalent Si4- atoms. All Ir–Si bond lengths are 2.42 Å. Si4- is bonded in a 4-coordinate geometry to four equivalent Sm2+ and four equivalent Ir3+ atoms.
SmIr2Si2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Sm2+ is bonded in a distorted body-centered cubic geometry to eight equivalent Si4- atoms. All Sm–Si bond lengths are 3.16 Å. Ir3+ is bonded to four equivalent Si4- atoms to form a mixture of edge and corner-sharing IrSi4 tetrahedra. All Ir–Si bond lengths are 2.42 Å. Si4- is bonded in a 9-coordinate geometry to four equivalent Sm2+, four equivalent Ir3+, and one Si4- atom. The Si–Si bond length is 2.49 Å.
SmIr2Si2 crystallizes in the tetragonal P4/nmm space group. The structure is three-dimensional. Sm2+ is bonded in a 8-coordinate geometry to eight Si4- atoms. There are four shorter (3.19 Å) and four longer (3.20 Å) Sm–Si bond lengths. There are two inequivalent Ir3+ sites. In the first Ir3+ site, Ir3+ is bonded to four equivalent Si4- atoms to form a mixture of edge and corner-sharing IrSi4 tetrahedra. All Ir–Si bond lengths are 2.45 Å. In the second Ir3+ site, Ir3+ is bonded in a 5-coordinate geometry to five Si4- atoms. There are one shorter (2.40 Å) and four longer (2.44 Å) Ir–Si bond lengths. There are two inequivalent Si4- sites. In the first Si4- site, Si4- is bonded in a 4-coordinate geometry to four equivalent Sm2+ and four equivalent Ir3+ atoms. In the second Si4- site, Si4- is bonded in a 9-coordinate geometry to four equivalent Sm2+ and five Ir3+ atoms.